wx:for做tab切换，动态class，传参

<view wx:for="{{navList}}" 
          wx:key='id' class="scroll-view-item_H {{index===activeIndex?'active-item':''}}" 
          bindtap='handleClickItem' 
          data-index="{{index}}"
>
  {{item.text}}
</view>

 handleClickItem(e){
    let {index} = e.currentTarget.dataset;
    this.setData({
      activeIndex:index
    })
  },